iRule conversion from 4.X to V9

Here's my crack, though I don't have a box currently to test on. I'm sure the and/or logic can be reduced, I'm curious if that would make the rule more processor efficient?

 

 

Unless jpg or gif would be anywhere else in your URL, I'd suggest using contains instead of ends_with. In the event a trailing / is appended in the uri, the rule wouldn't match. I added logging that you can use strictly while working on your rules.

 

 

rule Image_Rule {

 

 

when HTTP_REQUEST

 

{

 

if ( [HTTP::host} equals "www.mydomain.com" ) {

 

if ( [HTTP::uri] contains "jpg" ) {

 

use pool Image_Svr_80

 

log "JPG file requested by [IP::client_addr]"

 

}

 

elseif ( [HTTP::uri] contains "gif" ) {

 

use pool Image_Svr_80

 

log "GIF file requested by [IP::client_addr]"

 

}

 

else {

 

use pool Main_Svr_80

 

log "Default LB Method for [IP::client_addr]"

 

}

 

}

I think I missed a bracket or fifty:

 

 

rule Image_Rule {

 

 

when HTTP_REQUEST

 

{

 

if ( [HTTP::host} equals "www.mydomain.com" ) {

 

if ( [HTTP::uri] contains "jpg" ) {

 

use pool Image_Svr_80

 

log "JPG file requested by [IP::client_addr]"

 

}

 

elseif ( [HTTP::uri] contains "gif" ) {

 

use pool Image_Svr_80

 

log "GIF file requested by [IP::client_addr]"

 

}

 

}

 

else {

 

use pool Main_Svr_80

 

log "Default LB Method for [IP::client_addr]"

 

}

 

}

 

}

 

citizen_elah,

There's a few syntax errors (if's use curly braces, and else,elseif should be on the same line as closing curly brace) in there but by cleaning those your solution should work. Here are 3 possible rules (assuming the uri actually "ends with" the image type - otherwise use the "contains operator").

Here's a modified version of your solution

 when HTTP_REQUEST { 
   if { [HTTP::host] equals "www.mydomain.com" } { 
      if { [HTTP::uri] ends_with ".jpg" } { 
        use pool Image_Svr_80 
        log "JPG file requested by [IP::client_addr]"  
      } elseif { [HTTP::uri] ends_with ".gif" } { 
        use pool Image_Svr_80  
        log "GIF file requested by [IP::client_addr]"  
      } else { 
        use pool Main_Svr_80  
        log "Default LB Method for [IP::client_addr]"  
      } 
    } 
  }

If you want to shorten this up without all the detailed logging for each image type, you could also do the following

 when HTTP_REQUEST { 
    if { [HTTP::host] equals "www.mydomain.com" and \ 
        [HTTP::uri] ends_with ".jpg" or \ 
        [HTTP::uri] ends_with ".gif" } { 
      use pool Image_Svr_80 
      log "Image file requested by [IP::client_addr]"  
    } else { 
      use pool Main_Svr_80 
      log "Default LB Method for [IP::client_addr]"  
    } 
  }

If the group of image types increase, you might want to use a data group to store the image types to simplifly the script

 class images { 
    ".gif" 
    ".jpg" 
  } 
  
  when HTTP_REQUEST { 
    if { [HTTP::host] equals "www.mydomain.com" and \ 
        [matchclass [HTTP::uri] ends_with $::images] } { 
      use pool Image_Svr_80 
      log "Image file requested by [IP::client_addr]"  
    } else { 
      use pool Main_Svr_80 
      log "Default LB Method for [IP::client_addr]"  
    } 
  }

*Note that the "class image{...}" is not included in the rule but where declared externally as a data group list.

** Also note that the log lines are optional and can be included for trouble shooting.

-Joe